Unitisation and Redetermination of Petroleum Reservoirs

Disciplines: Management | Reservoir

Course Description

This course describes optimum procedures for the unitisation and subsequent redetermination of hydrocarbon reservoirs that straddle licence boundaries and/or international boundaries.

The content reflects the interdisciplinary nature of field unitisation, which can involve geoscientists, engineers, administrators, lawyers and accountants. Although the primary determination of equity is technical, by its nature the outcome is commercial. This interaction is managed by lending a technical emphasis to the presentations and allowing the commercial implications to become manifest through the exercises and discussion during the seminar.

This seminar comprises presentations and practical case studies.

Learning Level


Course Length

1-2 Days

Why Attend

  • Understand key issues involved with initial unitisation and subsequent redetermination
  • Provide an overview and understanding of the methodologies used to determine equity participation of reservoirs
  • Overview of key agreements, especially Unitisation Agreements, related to Unitisation
  • Understand the terminology and definitions used in Unitisation
  • Understand the options for the basis of unitisation, commonly used technical procedures and data issues
  • and case histories to illustrate key points, plus multiple stories and anecdotes from past unitisations

Who Attends

Attendees should be those technical and commercial staff including managers, who are involved in Unitisation & Redetermination. This may include commercial and legal staff involved in the preparation and negotiation of agreements as well as technical staff involved in preparing technical submissions to experts or other technical support to commercial negotiations. Technical disciplines may include: geophysicists, geologists, petrophysicists, reservoir engineers, economists, commercial, legal and management.

Special Requirements

Virtual Seminar - students must use their own laptop.


0.8  to 1.6 CEUs are awarded for this 1 to 2 day course.

Cancellation Policy

All cancellations must be received no later than 14 days prior to the course start date. Cancellations made after the 14-day window will not be refunded. Refunds will not be given due to no show situations.

Training sessions attached to SPE conferences and workshops follow the cancellation policies stated on the event information page. Please check that page for specific cancellation information.

SPE reserves the right to cancel or re-schedule courses at will. Notification of changes will be made as quickly as possible; please keep this in mind when arranging travel, as SPE is not responsible for any fees charged for cancelling or changing travel arrangements.

We reserve the right to substitute course instructors as necessary.


Douglas Peacock has over 35 years of experience in the oil industry covering a variety of geoscience positions, during employment with service companies, operators and consultancies. He has been involved in exploration, development and reserves estimation throughout his career. Currently, he is Technical Director – Geoscience based in GCA’s Singapore office. He is a recent (2013-16) member of the SPE Oil and Gas Reserves Committee (OGRC) and was an SPE Distinguished Lecturer during 2010-11. He has authored numerous technical papers from 1989-2018. He has given many industry training courses, mainly on reserves and resources, both for SPE and GCA. Doug holds a B.Sc. in Geology from Leeds University and a M.Sc. in Petroleum Geology from Imperial College, London.

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